[Xamarin][SignalR] Xamarin安裝SignalR套件 和 Xamarin.Form Error:CS0117

Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'System.Net.Http.Extensions, Version=1.5.0.0

Could not install package 'Microsoft.Bcl.Build 1.0.14'. You are trying to install this package into a project that targets 'MonoAndroid,Version=v6.0'

Error CS0117 'Resource.Attribute' does not contain a definition for ...

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